coordinate problems

[xxdaggerxx]

Hi guys, got a problem with the coordinates in a game im wrokin on.

The 0,0 coordinate is at the bottom left. I found this out using the mouse getX(),getY() (i returned the values on every frame).

Anyway i positioned my image on 0,0 but instead of appearing at the bottom left it appears at the top left.

Any clue why this might happen?

Thx guys

[oNyx]

The mouse coord-system doesnt neccessarily need to be indentical with the opengl one.

Decide which one you would like to use eg top/left equals 0/0 and setup everything that way (setup ortho like that and calculate the mouse y value each time yourself).